Printing plate and method of producing the same



Jan, 20 11925. 11,523,735

C. WAGNER PRINTING PLATE AND METHOD OF PRODUCING THE SAME Filed June 25, 1921 Zillnausea its at, rear.

W res stares GES WAGNER, 0F GRANTWOOD, NEW JERSEY.

ERINTETG PLATE AND METHGD 01F PROTDUCINGLTHE SAME Application filed June 25,

To (ZZZ whom it may 004mm:

Be it lmown that 1i 0 WAQNE'R, a citizen of the United tates, and a resident N21. Serial No. 480,288.

raised or impressed and coated portions is now preferably treated to cause the unraised and uncovered portions to be ink-reof'Grrantwood, in the'county of Bergen and jecting or otherwise treated in any convento State of New Jersey, have invented certain new and useful Improvements in Printing Plates and Methods of Producing the Same, of which the following is a specification.

This invention relates to. improvements in printing plates and methods of producing the same.

. @ne of the objects of this invention is to produce a printing plate comprising a sheet of relatively thin impressible material, such as sheet zinc, copper, aluminum, etc, provided with a printing-surface formed of impressions of suitable subject-matter impressed. through the plate from the obverse to the reverse side thereof so as to cause such impressions to be raised or embossed on said reverse side. Such impressions are preferably coated with carbon or other suitable material, and to this end, the plate is preferably backed with a sheet of carbon paper or the like disposed with the carbon-covered face of the paper abutting against the reverse side of the metallic sheet sothat the impressions or impressed portions of the plate will take up and become coated with such material inert to the action of an etching bath,

the uncovered portions of the plate being simultaneously impressed through the metal.

etched or treated with chromic acid to cause the same, when wetted with water, to be inkrejecting. n

Another object of my invention is to provide an extremely simple process for producing a durable printing plate which may bdused efiectively to make a large number of printed copies without destruction and,

to this end, ll take a sheet of suitable hard press throughrthe relatively thin printing plate or shell the particular subject-matter which it is desired to print. Upon such impression, the carbon of the carbon paper will adhere t6 and coat or cover the impressed, raised portions of the plate only, leaving the balance of the reverse surface free. The surface of the plate. having these tional manner, for example, by the use of a suitable chromic acid solution or its equivalent, such as is usual in lithographing or like arts, and such reverse side is thereafter inked and printed from in any known manner. A plate so produced provides a printing surface with sharp raised outlines of the impressed and coated characters on the reverse side of the plate and a large number of prints may be made from such plate.

With these and other objects in view, the invention comprises the combination of members and arrangement of parts so combined as to co-act and cooperate with each other in the performance of the functions and the accomplishment of the results herein. contemplated, and cdmpriscs in one of its adaptations the species or preferred form illustrated in the accompanying'drawings, in which Fig. 1 is a plan view'of a metallic printing plate backed up by a sheet of carbon paper and having printed characters impressed through the metal plate;

Fig. 2 shows ametal plate and carbon in a typewriting machine having the characters and coated with carbon; and

Fig.3 is a section through a portion of a printing plate made in accordance with my invention.

Referring now to these drawings, 1 indicates a plate of suitable material which is preferably composed of thin sheet metal such as zinc, copper, aluminum or the like, and 2 indicates a sheet containing a surface of carbon or other suitable character-covering substance. When a sheet of'carbon is used,

-suitable mannerfas, for example, a printing plate of any type or other design may llfl be employed and impressed into and through said plate by a suitable press or in any other way, or in accordance with my preferred method, the metallic plate which is thin and flexible may, with its backing of carbon or like covering material, be inserted in a type- ,writing machine and the impressions from the typeof such a machine may be'made through such metal plate by striking the type on the obverse side in the usual manner of typewriting exceptthat no ribbon is employed. This will cause the usual reverse type similarto that on the typewriting machine to be formed on the reverse side of the metal sheet and these reverse type or characters will be covered by carbon or like covering material.

In plates of this character, however, the signature of a person may be readily impressed in the plate by a pencil or other sharp instrument and when so impressed a reversed reproduction thereof in relief and coated with carbon will be formed on the reverse side thereof. electrotypes or other printing surfaces may be made by simply impressing such printing surfaces into'the obverse side of my hard impressible printing plate so as to procure carbon coated raised surfaces on the opposite side thereof. The surface of the plate having these raised or impressed and coated portions is now preferably treated with a suitable chromic-acid solution to cause the unraise'd and uncovered portions when wetted with water to be ink-rejecting or said plate may be otherwise treated in any conventional manner such as is usual in lithographing or like arts, and such reverse side is thereafter inked and printed from in any known manner. A plate so produced provides a printing surface with sharp raised outlines of the impressed and coated characters on the reverse side of the plate and a large number of prints may be made from such plate. v I

Having described my invention, I claim 1. A printing surface comprising a sheet of suitable material having reversed print-- ing matter impressed through the plate and raised on the reverse side thereof, said raised surface having a coating of a suitable covering substance" and the unraised and uncovered portions of said surface. printing plate comprising a sheet of metal having reversed printing matter implate having an ink-re- Similarly copies of pressed throughthe plate and raised on the printing surface.

4. The process of producing metal plates comprising the taking of a relatively thin sheet of suitable hard though impressible material, impressing therein suitable subject-matter to be printed, covering the raised surface with carbon, treating the uncovered portion of such plate to cause the same to be ink-rejecting and then utilizing the said plate as a printing surface.

5. The process of producing printed plates comprising the taking of a relatively thin sheet of suitable hard though impressible material, superimposing said thin impressible sheet on another sheet carrying a covering substance adapted to adhere under pressure and impressing through said hard impressible plate suitable subject-matter for printing, whereby the impressed subject-matter is coate with said material, and treating the uncoated portions of said plate.

'6. The process of producing metal plates comprising the taking of a relatively thin sheet of suitable hard though impressible material, backing up such metal plate with a sheet of carbon paper with the carbon surface abutting against the reverse side of the metal plate, impressing printing characters through said plate to simultaneously pro, cure the raising of reverse characters and the covering thereof with carbon, then treating the unraised and uncovered portions to cause the same to be ink-rejectingan d'then utilizing said plate as a printing surface.

In witness whereof, I have signed my name to the foregoing specification in the presence of two subscribing witnesses.

. CHARLES WAGNER.

WVitnesses: AUGUST N ORMEL,

ALBERT MUELLER. 

